I think it was Mike Carter that had this one on his table in Chicago:
No question from the profile that it is a Zaner Bloser, made in Columbus, Ohio. Although I've posted pictures before of wood examples, all the ones I've had are painted, rather than stained and varnished like this one. Judging from the good condition of the trim, I was sure this was originally finished like this rather than by a do-it-yourselfer who wanted to clean up a chipped pencil:
To be sure, I turned it over to see if the typical "Zaner Bloser Cols. O." imprint had been obliterated, and I found a different imprint entirely:
Yep, I'd say it's definitely supposed to be like that!